1 /* k_cosf.c -- float version of k_cos.c
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
13 * ====================================================
15 * $NetBSD: k_cosf.c,v 1.7 2002/05/26 22:01:53 wiz Exp $
16 * $DragonFly: src/lib/libm/src/k_cosf.c,v 1.1 2005/07/26 21:15:20 joerg Exp $
20 #include "math_private.h"
23 one
= 1.0000000000e+00, /* 0x3f800000 */
24 C1
= 4.1666667908e-02, /* 0x3d2aaaab */
25 C2
= -1.3888889225e-03, /* 0xbab60b61 */
26 C3
= 2.4801587642e-05, /* 0x37d00d01 */
27 C4
= -2.7557314297e-07, /* 0xb493f27c */
28 C5
= 2.0875723372e-09, /* 0x310f74f6 */
29 C6
= -1.1359647598e-11; /* 0xad47d74e */
32 __kernel_cosf(float x
, float y
)
37 ix
&= 0x7fffffff; /* ix = |x|'s high word*/
38 if(ix
<0x32000000) { /* if x < 2**27 */
39 if(((int)x
)==0) return one
; /* generate inexact */
42 r
= z
*(C1
+z
*(C2
+z
*(C3
+z
*(C4
+z
*(C5
+z
*C6
)))));
43 if(ix
< 0x3e99999a) /* if |x| < 0.3 */
44 return one
- ((float)0.5*z
- (z
*r
- x
*y
));
46 if(ix
> 0x3f480000) { /* x > 0.78125 */
49 SET_FLOAT_WORD(qx
,ix
-0x01000000); /* x/4 */
53 return a
- (hz
- (z
*r
-x
*y
));